java/admin/src/main/java/com/exadel/frs/helpers/EmailSender.java
/*
 * Copyright (c) 2020 the original author or authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

package com.exadel.frs.helpers;

import com.exadel.frs.exception.UnreachableEmailException;
import javax.mail.internet.MimeMessage;
import lombok.SneakyThrows;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.mail.MailException;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;

@Service
public class EmailSender {

    @Value("${spring.mail.from}")
    private String from;

    @Autowired
    private JavaMailSender javaMailSender;

    @SneakyThrows
    public void sendMail(final String to, final String subject, final String message) {
        MimeMessage msg = javaMailSender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(msg, true);
        if (StringUtils.isNotEmpty(from)) {
            helper.setFrom(from);
        }
        helper.setTo(to);
        helper.setSubject(subject);
        helper.setText(message);

        try {
            javaMailSender.send(msg);
        } catch (MailException e) {
            throw new UnreachableEmailException(to);
        }
    }
}